Posted by Kyle on Monday, April 9, 2012 at 9:29am.
Rewrite as:
3+9i-12+5i
Add like terms:
-9+14i is your answer.
for the 2nd, multiply top and bottom by 7+5i
(8+6i)/(7-5i) * (7+5i)/(7+5i)
=(56 + 40i + 42i + 30i^2)/(48 - 25i^2)
= (26 + 82i)/73 . remember i^2 = -1
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